Edit: For updated question
Use .blur() and an anonymous function for this (doesn't matter how many elements there are):

$(":input").blur(function() {
//do stuff
});

If you need to bind certain functions to certain fields, use classes or an attribute selector on name, anything to distinguish them...if the selector doesn't find an element it simply won't bind an event handler to anything. That way, the same overall code works for all users, even if they only see some of the form elements available.

For original question: if elements were dynamically added after page-load.
I think .live() to capture the blur event is what you're after here, using :input as the selector: